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This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A274785 Diagonal of the rational function 1/(1-(w*x*y*z + w*x*z + w*y + x*y + z)).

Table of values

n a(n)
0 1
1 1
2 25
3 121
4 2881
5 23521
6 484681
7 5223625
8 97949041
9 1243490161
10 22061635465
11 309799010665
12 5331441539425
13 79799232449665
14 1352284119871465
15 21095036702450281
16 355125946871044561
17 5694209222592780625
18 95705961654403180201
19 1563714140278617173641
20 26311422169994777663761

List of values

[1, 1, 25, 121, 2881, 23521, 484681, 5223625, 97949041, 1243490161, 22061635465, 309799010665, 5331441539425, 79799232449665, 1352284119871465, 21095036702450281, 355125946871044561, 5694209222592780625, 95705961654403180201, 1563714140278617173641, 26311422169994777663761]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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